五孔管による小模型まわりの流場計測

概要

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Effective measurements of the three-dimensional flow velocity components around 2m small models are investigated where a specially developed mini five-hole spherical pitot tube of 6mm diameter is applied. The study indicates that: On the measuring devices; (1) The adoption of force-balanced pressure transducer is quite essential which enables the 'time-constant' short and transforms low level pressure movements faithfully. (2) The equipment to calibrate and traverse the pitot-tube should be so designed that actual measurements may be followed right away after calibration tests without removal of any part of this equipment. On the accuracy obtained; (3) Errors associated with measurements are both small in flow direction and in flow component (Figs. 2.4, 2.5). (4) The free surface effect on Vx and Vz cannot be ignored while the same effect on Vy is negligible (Fig. 3.1).
社団法人日本船舶海洋工学会の論文
1974-09-30